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Accumulated Other Comprehensive Loss - Schedule of Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Millions | 9 Months Ended
--- | ---
Sep. 30, 2018 | Sep. 30, 2017
Accumulated Other Comprehensive Income Loss [Line Items] |  |
Balance | $ 37,261 | $ 41,529
Other comprehensive gain (loss) before reclassifications | (167) | 2
Amounts reclassified from accumulated other comprehensive loss | 128 | 183
Income taxes |  | (2)
Net other comprehensive income | (39) | 183
Balance | 36,948 | 40,010
Currency Translation Adjustments |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |
Balance | (2,139) | (2,136)
Other comprehensive gain (loss) before reclassifications | (128) | 49
Net other comprehensive income | (128) | 49
Balance | (2,267) | (2,087)
Marketable Securities |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |
Balance | 13 | 21
Other comprehensive gain (loss) before reclassifications | (33) | (66)
Net other comprehensive income | (33) | (66)
Balance | (20) | (45)
Cash Flow Hedges |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |
Balance | 3 | (19)
Other comprehensive gain (loss) before reclassifications | (6) | 19
Amounts reclassified from accumulated other comprehensive loss | (2) | 4
Net other comprehensive income | (8) | 23
Balance | (5) | 4
Pension and Other Postretirement Benefit Plans |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |
Balance | (2,151) | (2,509)
Amounts reclassified from accumulated other comprehensive loss | 130 | 179
Income taxes |  | (2)
Net other comprehensive income | 130 | 177
Balance | (2,021) | (2,332)
Accumulated Other Comprehensive Loss |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |
Balance | (4,274) | (4,643)
Balance | $ (4,313) | $ (4,460)

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- Definition Amount before tax and reclassification adjustments of other comprehensive income (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669686-108580 + Details
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